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Wet Abrasive Blasting: the Future of Surface Preparation and the Effects it has on Steel

Wet Abrasive Blasting: the Future of Surface Preparation and the Effects it has on Steel
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With more stringent silica regulations being enforced, wet abrasive blasting is becoming more prevalent in the industry. We investigated the viability of wet abrasive blasting as compared to the more commonly used dry abrasive blast. One added benefit of wet abrasive blasting is the removal of soluble salts in addition to providing the specified profile.

Product Number: 51220-232-SG
Author: Brady DeRoche
Publication Date: 2020
Industry: Coatings
$0.00
$20.00
$20.00

With more stringent silica regulations being enforced, wet abrasive blasting is becoming more prevalent in the industry. We investigated the viability of wet abrasive blasting as compared to the more commonly used dry abrasive blast. One added benefit of wet abrasive blasting is the removal of soluble salts in addition to providing the specified profile.  Our study explored the use of available additives intended to aide in the removal of soluble salts and preventing flash rust. We found the use of the additives, in tandem with wet abrasive blast standards, effectively removed soluble salts, inhibited flash rusting and did not adversely affect the performance of applied coating systems.

With more stringent silica regulations being enforced, wet abrasive blasting is becoming more prevalent in the industry. We investigated the viability of wet abrasive blasting as compared to the more commonly used dry abrasive blast. One added benefit of wet abrasive blasting is the removal of soluble salts in addition to providing the specified profile.  Our study explored the use of available additives intended to aide in the removal of soluble salts and preventing flash rust. We found the use of the additives, in tandem with wet abrasive blast standards, effectively removed soluble salts, inhibited flash rusting and did not adversely affect the performance of applied coating systems.

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Restoration of steel and concrete surfaces has relied heavily on sandblasting and other dry blasting techniques. For over a century, dry blasting has been an effective, but dusty approach in removing coatings, contaminants, corrosion, and residues, with emissions of silica and other abrasive or substrate particles linked to negative health and environmental impacts. 
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Modern design, manufacturing and field-testing specifications include surface profile and adhesion testing on the assumption that they are linked to long term corrosion prevention. There are a number of careful studies, dating back decades, that find no link between measurements of adhesion and (undercutting) corrosion performance, but other studies do, and the concept remains intuitively appealing and widely assumed.
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International standards, both ISO and ASTM, require that the attributes exhibited during an adhesion test are recorded as part of the results. What are these attributes, how should they be recorded and what value are they to the inspector and applicator in assessing the reason for failure?  This paper looks at all these questions and asks should we be going further than we do in defining the mode of failure.
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